debugging: lowered timer debug messages to debug2
Merge pull request #395 from mtomaschewski/timer-debug

debugging: lowered timer debug messages to debug2
Restore config check in ni_dhcp4_fsm_release

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Retry DHCP4 rebind until lease_time is reached

Signed-off-by: Olaf Hering <olaf@aepfle.de>